Tool for upsetting internally threaded rivets



June 23, 1953 l2,643,019

` Tool. 'Fon UPSETT'ING INTERNALLY maximum RIvETs I H. E. WILT Filed April 15, 195o Y, Wm..

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Patented June 23, 1953 TOOL FOR UPSETTING INTERNAIJLY THREADED RIVETS Homer E. Wilt, Akron, Ohio, assig'nor to The B. li'.y Goodrich Company, New York, N. Y., a.

corporation of New York Application April 13, 195o, serial No. 155,663

2 claims. (o1. 218-19) This invention relates to tools for upsetting internally threaded tubular rivets.

For use in upsetting internally threaded tubular rivets from one face of the Work, it has been proposed, to provide hand-operated tools in which a threaded mandrel and an anvil through which the mandrel extends are provided With means for rotatingone relative to the other to engage the threads of the mandrel in the threads of the rivet, and means have been proposed to move the mandrel and` the anvil relative to each other axially of the mandrel to upset the rivet. While apparatus heretofore. proposed for the .purpose has 'been generally satisfactory, it has been found that where it was attempted to work overhead with such apparatus, portions of the apparatus have been so acted upon by the force of gravitation as to cause maladjustment of the apparatus requiring adjustment by the operator.

It is an object of the present invention to provide `forimprovement of the apparatus to prevent such difficulties as those enumerated above.

Other objects are to provide for operation of the apparatus in an overhead position without objectionable gravitational effects, to provide for maintaining certain .moving parts in the desired position, to provide for increased convenience yoi the tool in use, and to provide for simplicity of construction.

These .and other .objects will appear frornthev following description and the accompanying drawings.

Of the drawings,

Fig. 1 is a side view of a tool constructed in accordance with and embodying the invention, f

parts being breiten away and parts shown in section,

Fig. 2 is an enlarged detail view of the sectional portion of Fig. 1.

Fig. 3 is a sectional view, tak-en on line 2--2 of Fig. 3.

Referring to the drawings, the numeral Il) designates a tubular body in the end of which a hollouT anvil H is secured, as by threads I2. A threaded draw rod i3 extends slidably through the anvil with its threaded end exposed for engaging the threaded bore of the rivet I 4. The inner end of the draw rod is also threaded to engage the threaded bore of a block or collar I5 slidahly tted in the tubular body and fixed to r the rod against relative rotation by a set-screw i5. A second collar il is secured to the draw rod i3. as by a set screw i3 and is also slidably fitted within the bore of the tubular body IIJ. The collars l5 and ll are spaced apart and between them 2 a collar 20 is slidably mounted Within the tubular body and about the draw rod.

For moving the draw rod axially of the body .to collapse a rivet threaded upon the draw rod by engagement with the anvil, a cross pin 2| extends through the collar 20 and through opposite clearance slots 22 in the walls of the tubular body With its ends engaging openings in the limbs of a forked lever 23. The lever 23 is pivotecl on a pin 24 extending through an ear 25 of the tubular body. A tension coil spring 26 is secured between the body lll and the lever 23 to hold the rod i3 normally in advanced position. The lever arm is normally inclined to the tubular body lll and may be moved `toward the body to retract the draw rod against the spring tension. The

Varrangement is such that in the advanced position of the vdravv rod it may be threaded into a rivet and as the lever is pressed toward the tubular body, the draw rod is retracted and the rivet upset.

For rotating the draw rod to thread it into and out of the rivet, a Worm 30 is provided Within the tubular body extending axially thereof. One end of the Worm 30 is retained in a cross-slot 3l of the collar I5, as by a cross pin 32 extending therethrough. A tubular plunger or thrust member 33 is slidably fitted in the bore of the tubular body l0 and about the Worm 30. A plunger handle 34 is secured to the outer end of the plunger as by a dovvel 35 thereon entering the bore of the yplunger' and a connecting cross pin 35 therej through.

For driving the Worm 39, balls 3l are mounted for free rotation in sockets formed diametrically opposite each other in the Walls of plunger 33. These balls engage in opposite grooves of the vworm 3l) and cause the Worm to rotate When the plunger 33 is moved axially.

A guide collar or bushing 4U is secured in the end of the tubular body, as by threads and surrounds the plunger 33. The inner end of the plunger is slightly enlarged, as at 4l providing a shoulder preventing full Withdrawal o the bilizing means for the plunger. For this purpose the guide collar 40 is provided with a groove 45 about its inner periphery which groove is square in cross-section as shown in Fig. 2. A plunger-engaging member 46 is seated within the groove to engage against the plunger 33 and provide a frictional braking force. The plungerengaging member is preferably of ring form and preferably round in cross section, the eye or aperture of the ring being normally smaller than the diameter of the plunger 33, so that the ring which is of elastic resilient material, such as rubber, or other ruber-like material, will be stretched in use so as to maintain contact with the plunger under tension of the ring. Groove 45 is preferably made slightly wider than the axial width of the ring so as to clear the ring axially and the radial depth of the groove is preferably greater than the radial thickness of the ring so that the ring is not radially compressed in use, but is radially free of compression as indicated in Fig. 2, where the ring 46 will be seen to clear the sides and bottom of the groove 45. With such clearance provided about the ring, frictional resistance to both axial and frictional movement of the plunger, such as would occur during withdrawal of the plunger from the body of the tool, is provided by contact of the ring 46 With the plunger, the ring being free from lateral compression or lateral conning pressure and depending for its frictional resistance upon the contracting force, inherent in the ring itself. Good results have been obtained where the plunger was of {'g outside diameter with a ring having a normal inside diameter of the ring being of circular cross section, g in diameter, and operating in a groove of 7/64 or greater width and a 3%" or greater depth. As the ring is stretched about the plunger, this decreases its radial thickness so that it clears the bottom of the groove as shown in Fig. 2. Some rolling of the ring 46 along the plunger takes place to the extent permitted by its confining groove so that wear is not constantly upon one area and localized wear of the ring is avoided.

When the tool is used overhead with its plunger in a vertical position, the contact of the ring 46 with the plunger is sufficient to prevent gravitational displacement of the plunger ordinarily made possible by rotation of the plunger about the worm 30 upon release of the operators hand from the plunger head 34, While the frictional drag on the plunger, when the plunger is used to rotate the draw rod, will be so slight as to be negligible.

While the ring 46 is preferably of round crosssection, rings of other cross sections, such as square or triangular, may be employed.

Variations may be made without departing from the scope of the invention, as it is defined by the following claims.

I claim:

1. A tool for upsetting hollow internally threaded rivets, said tool comprising a tubular body having at one end thereof an apertured anvil for engaging against a rivet, a threaded draw rod extending through said anvil to engage the threads of the rivet, a plunger slideably mounted in said body for rotating said draw rod, and stabilizing means engaging said plunger to resist accidental movement thereof, said stabilizing means comprising a retainer on said body having an annular groove about said plunger and open toward the face of said plunger, resilient ring of rubber material Within said groove and at all times stretched about said plunger, said ring being round in cross section and having, in an unstretched condition before assembly with the other parts of the tool, an internal diameter less than the diameter of said plunger and contacting about said plunger, said groove providing clearance about said ring to permit slight rolling movement thereof, said resilient ring normally providing limited resistance to sliding movement of said plunger.

2. A tool for upsetting hollow internally threaded rivets, said tool comprising a tubular body having at one end thereof an apertured anvil for engaging against a rivet, a threaded dra-w rod extending through said anvil to engage the threads of the rivet, a plunger slidably mounted in said body for rotating said draw rod, said plunger having a smooth uninterrupted cylindrical surface of substantially uniform diameter throughout the length of the central portion thereof, and stabilizing means engaging said plunger to resist accidental movement thereof, said stabilizing means comprising a retainer on said body having an annular groove about said plunger and open toward the face of said plunger, the groove having fiat longitudinally-spaced sides extending radially of the plungery and an endless resilient ring of rubber material having a circular crosssectional shape seated within said groove and at all times stretched about said plunger, said ring having in its unstretched condition before assembly with the plunger an internal diameter less than the diameter of said plunger and contacting said smooth uninterrupted cylindrical surface of said plunger, the stretched resilient ring and said longitudinally-spaced sides of said groove and said central portion of said plunger cooperating to provide a substantially uniform predetermined resistance to sliding movement of said plunger.

HOMER E. WILT.

References Cited in the file of this patent Y UNITED STATES PATENTS Number Name Date 1,464,263 Gardner Aug. 7, 1923 1,735,949 Brady Nov. 19, 1929 1,800,254 Holmes Apr. 14, 1931 1,932,780 Hartman Oct. 31, 1933 2,358,703 Gookin Sept. 19, 1944 2,575,479 Wilt Nov. 20, 1951 

